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block: fix double account of flush request's driver tag 

In case of none scheduler, we share data request's driver tag for
flush request, so have to mark the flush request as INFLIGHT for
avoiding double account of this driver tag.

Fixes: 568f270065 ("blk-mq: centralise related handling into blk_mq_get_driver_tag")
Reported-by: Matthew Wilcox <willy@infradead.org>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Tested-by: Matthew Wilcox <willy@infradead.org>
Cc: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Ming Lei 2020-08-10 11:59:50 +08:00 committed by Jens Axboe
parent fe6a8fc5ed
commit c1e2b8422b
1 changed files with 9 additions and 2 deletions
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11
block/blk-flush.c
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@ -308,9 +308,16 @@ static void blk_kick_flush(struct request_queue *q, struct blk_flush_queue *fq,
flush_rq->mq_ctx = first_rq->mq_ctx;
flush_rq->mq_hctx = first_rq->mq_hctx;
if (!q->elevator)
if (!q->elevator) {
flush_rq->tag = first_rq->tag;
else
/*
* We borrow data request's driver tag, so have to mark
* this flush request as INFLIGHT for avoiding double
* account of this driver tag
*/
flush_rq->rq_flags |= RQF_MQ_INFLIGHT;
} else
flush_rq->internal_tag = first_rq->internal_tag;
flush_rq->cmd_flags = REQ_OP_FLUSH | REQ_PREFLUSH;